Fujitsu Mini-Split: 3 Flashes
A Fujitsu mini-split LED pattern starting with 3 flashes matches 5 documented codes: 32, 33, 35, 39, 3A. Watch the full pattern (short vs. long flashes) to tell them apart — all 5 are explained below.
Code 32: Indoor unit model information error / EEPROM access abnormal
Indoor unit model information error / EEPROM access abnormal. The indoor board cannot read the memory chip that stores the unit's model data.
Manual wording: “EEPROM Error - Electronically erasable and programmable read only memory... -Check if the ground connection is proper.”
Documented for: RGLX, RL2/RLS3/RLB/RLXB wall mounted, RLF/RLF1 multi-zone
Likely causes, most common first
- Poor or missing ground connection at the unit
- Electrical noise or harmonics on the power circuit (for example a nearby neon fixture or other noisy load)
- Failed indoor controller PCB
What you can safely check yourself
- Turn the power off at the breaker for about 5 minutes and back on to see whether the code clears
When to call a technician
If the code returns, the indoor control board or its ground has to be checked and the board is usually replaced. That is a technician's job.
A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- 410A Mini-Split Troubleshooting Guide (Part # 6-26-FG2020 Rev. 5/2019) (Fujitsu General America, Inc., All R410A Halcyon mini-splits: RGLX, RL2/RLS3/RLS3H/RLS3Y/RLB/RLXB/RLXEH wall mounted, RLF/RLF1 multi-zone indoor units, RLXFZ multi-zone outdoor units, RML/RMLQ, RULX/RSLX universal-mount, RCLX cassettes) · checked 2026-08-25
Code 33: Indoor unit motor electricity consumption detection error
Indoor unit motor electricity consumption detection error. The voltage or current the indoor fan motor is drawing has gone outside its allowed limits.
Manual wording: “Indoor unit motor electricity consumption detection error - When the voltage value or current value of the motor go beyond the limits.”
Documented for: AUU18-48RGLX, ARU12-48RGLX
Likely causes, most common first
- Indoor fan caught, dropped off its shaft, or the motor is locked
- Excessively high ambient temperature around the fan motor from nearby equipment
- Failed indoor fan motor
- Failed indoor controller PCB
What you can safely check yourself
- Replace or clean the return air filter
- Make sure supply and return grilles are open and not blocked by furniture or drapes
- Turn the power off at the breaker for about 5 minutes and back on
When to call a technician
Checking the blower wheel and motor windings means removing panels with the unit powered. Have a technician do it.
A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- 410A Mini-Split Troubleshooting Guide (Part # 6-26-FG2020 Rev. 5/2019) (Fujitsu General America, Inc., All R410A Halcyon mini-splits: RGLX, RL2/RLS3/RLS3H/RLS3Y/RLB/RLXB/RLXEH wall mounted, RLF/RLF1 multi-zone indoor units, RLXFZ multi-zone outdoor units, RML/RMLQ, RULX/RSLX universal-mount, RCLX cassettes) · checked 2026-08-25
Code 35: Manual auto switch error
Manual auto switch error. The MANUAL AUTO button on the indoor unit has read as pressed for 60 or more consecutive seconds.
Manual wording: “Manual Auto Switch Error - When the manual auto switch becomes on for 60 or more consecutive seconds.”
Documented for: RGLX, RL2/RLS3/RLB/RLXB wall mounted, RLF/RLF1 multi-zone
Likely causes, most common first
- The manual/auto button is physically stuck in, jammed by the front panel, or held down
- Failed manual auto switch
- Failed indoor controller PCB
What you can safely check yourself
- Make sure the front panel and filter access cover are fully closed and seated, so nothing is holding the MANUAL AUTO button in
- Look at the MANUAL AUTO button on the indoor unit and confirm it is not stuck in the pressed position
- Turn the power off at the breaker for about 5 minutes and back on
When to call a technician
If the button is not physically stuck, the switch or the control board is at fault and a technician must test it.
A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- 410A Mini-Split Troubleshooting Guide (Part # 6-26-FG2020 Rev. 5/2019) (Fujitsu General America, Inc., All R410A Halcyon mini-splits: RGLX, RL2/RLS3/RLS3H/RLS3Y/RLB/RLXB/RLXEH wall mounted, RLF/RLF1 multi-zone indoor units, RLXFZ multi-zone outdoor units, RML/RMLQ, RULX/RSLX universal-mount, RCLX cassettes) · checked 2026-08-25
Code 39: Indoor fan motor power supply error
Indoor fan motor power supply error. The indoor board has lost the supply feeding the fan motor, usually from a voltage drop, electrical noise, or an open connector.
Manual wording: “Check external cause at indoor and outdoor units (voltage drop or noise) ... Check if cable is open. (Upon correcting removed connector, reset the power)”
Documented for: AUU18-48RGLX, ARU12-48RGLX
Likely causes, most common first
- Voltage drop or electrical noise from a large load sharing the same circuit
- Defective contact or leakage current in the power supply circuit
- Connector removed, mis-connected, or an open cable to the fan motor
What you can safely check yourself
- Check whether a large appliance shares the same circuit and started at the same time the fault appeared
- Turn the power off at the breaker for about 5 minutes and back on
When to call a technician
Connector and supply-circuit checks are inside the powered electrical box. Leave that to a technician.
A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- 410A Mini-Split Troubleshooting Guide (Part # 6-26-FG2020 Rev. 5/2019) (Fujitsu General America, Inc., All R410A Halcyon mini-splits: RGLX, RL2/RLS3/RLS3H/RLS3Y/RLB/RLXB/RLXEH wall mounted, RLF/RLF1 multi-zone indoor units, RLXFZ multi-zone outdoor units, RML/RMLQ, RULX/RSLX universal-mount, RCLX cassettes) · checked 2026-08-25
Code 3A: Indoor unit communication circuit
Indoor unit communication circuit (wired remote controller) error. The indoor unit sees an abnormal remote controller group configuration, or cannot find the primary remote controller.
Manual wording: “Indoor Unit Communication Circuit (WRC) Error - When the indoor unit detects the configuration of the remote controller group is abnormal or the indoor unit detects lack of primary remote controller.”
Documented for: RGLX, RL2/RLS3/RLB/RLXB wall mounted with UTY-series wired remote controllers
Likely causes, most common first
- Disconnected or shorted cable between the wired remote controller and the indoor unit, or between indoor units
- Failed wired remote controller (indicated when 12 VDC is present at controller PCB connector CNC01)
- Failed indoor controller PCB (indicated when 0 VDC is present at CNC01)
What you can safely check yourself
- Turn the power off at the breaker for about 5 minutes and back on to see whether the code clears
When to call a technician
Diagnosing this requires metering 12 VDC at a board connector inside the indoor unit. A technician must do that.
A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- 410A Mini-Split Troubleshooting Guide (Part # 6-26-FG2020 Rev. 5/2019) (Fujitsu General America, Inc., All R410A Halcyon mini-splits: RGLX, RL2/RLS3/RLS3H/RLS3Y/RLB/RLXB/RLXEH wall mounted, RLF/RLF1 multi-zone indoor units, RLXFZ multi-zone outdoor units, RML/RMLQ, RULX/RSLX universal-mount, RCLX cassettes) · checked 2026-08-25